鼓泡两相流临界雷诺数的实验研究

Q2 Engineering

INCAS Bulletin Pub Date : 2023-09-04 DOI:10.13111/2066-8201.2023.15.3.4

Marshall C. Mccray, P. Cizmas

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引用次数: 0

摘要

实验研究了气液两相流的临界雷诺数。在这个实验中，气体是空气，液体是水。水通过一个垂直的半透明管道向上流动，在测试部分之前，通过软木微气泡将空气引入水中。染料被注入水中，以指示水流何时从层流转变为湍流。对气体体积分数高达10%的混合物进行了测试，并记录了流动从层流过渡到湍流的雷诺数。数据显示，一旦气体体积分数超过0.1%，临界雷诺数就会降至其原始单相液体值的一半左右。这些结果表明，即使是少量气泡的存在，也会导致成熟前向湍流过渡。

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Experimental investigation of the critical Reynolds number for bubbly two-phase flow

The critical Reynolds number for dispersed bubbly two-phase flows, gas in liquid, was experimentally investigated. In this experiment, the gas was air and the liquid was water. Water flowed upward through a vertical, translucent pipe, and air was introduced into the water prior to the test section by means of a basswood microbubbler. Dye was injected into the water to indicate when the flow transitioned from laminar to turbulent. Mixtures with gas volume fractions up to 10% were tested, and the Reynolds numbers for which the flow transitioned from laminar to turbulent were recorded. The data showed that the critical Reynolds number fell to roughly one-half of its original single-phase liquid value once the gas volume fractions exceeded 0.1%. These results indicate that the presence of even small amounts of bubbles causes pre-mature transition to turbulence.

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来源期刊

INCAS Bulletin Engineering-Aerospace Engineering

自引率

0.00%

发文量

审稿时长

8 weeks

期刊介绍： INCAS BULLETIN is a scientific quartely journal published by INCAS – National Institute for Aerospace Research “Elie Carafoli” (under the aegis of The Romanian Academy) Its current focus is the aerospace field, covering fluid mechanics, aerodynamics, flight theory, aeroelasticity, structures, applied control, mechatronics, experimental aerodynamics, computational methods. All submitted papers are peer-reviewed. The journal will publish reports and short research original papers of substance. Unique features distinguishing this journal: R & D reports in aerospace sciences in Romania The INCAS BULLETIN of the National Institute for Aerospace Research "Elie Carafoli" includes the following sections: 1) FULL PAPERS. -Strength of materials, elasticity, plasticity, aeroelasticity, static and dynamic analysis of structures, vibrations and impact. -Systems, mechatronics and control in aerospace. -Materials and tribology. -Kinematics and dynamics of mechanisms, friction, lubrication. -Measurement technique. -Aeroacoustics, ventilation, wind motors. -Management in Aerospace Activities. 2) TECHNICAL-SCIENTIFIC NOTES and REPORTS. Includes: case studies, technical-scientific notes and reports on published areas. 3) INCAS NEWS. Promote and emphasise INCAS technical base and achievements. 4) BOOK REVIEWS.